Characteristics analysis and experimental verification of the double LCL resonant compensation network for electrical vehicles wireless power transfer

This paper presents the study and analysis of the wireless power transfer (WPT) system for electric vehicles (EVs) based on the double-LCL resonant network. The electromagnetic coupling relationship for the EVs WPT system and the features of four basic compensation networks are analyzed firstly. Then the characteristics of the transmitting and receiving terminals with the double-LCL resonant network for the EVs WPT system are discussed in detail under the horizontal or vertical misalignment conditions. Finally, the 3-D finite element analysis package Ansoft is utilized to verify the network. A 5.5 kW experimental system with circular pads is set up. Two conditions are discussed, i. e. 200 mm air gap with 120 mm horizontal misalignment at most and no horizontal misalignment with air gaps ranging from 150 to 250 mm. Under the condition of 200 mm gap without horizontal misalignment, the experimental system can transfer the maximum power about 5.5 kW with the highest efficiency of 95.37%. ©, 2015, The editorial office of Transaction of China Electrotechnical Society. All right reserved.